Detailed experience record

2010 It-tools for the Danish national groundwater model (DK-model)
Software developer
Development of various it-tools for automating the data updating process of the Danish nationwide groundwater model (DK-model) .

2010 OpenMI support to Kisters AG

Software architect and developer
Development for and support to Kisters AG in Aachen, Germany in connection to OpenMI migration of WISKI – (water information and water management system)

2010 SØMOD 
Project leader, software developer
Development of IT-System for mapping groundwater and surface water exchange by use of integrated data analysis and integrated modelling.

2009 Model development
project leader
Development of conceptual water resource management model. HydroInform internal development project.

2006 – 2008 OpenMI LIFE
Project leader
The purpose of the OpenMI LIFE project is to demonstrate how the OpenMI Standard can be used for full-scale applications and, based on experiences from this, to develop the next version of the OpenMI Standard. Jan Gregersen was leading the OpenMI Association Technical Committee, which is responsible for developing the Standard and the supporting tools, and supporting the OpenMI developers’ community.

2007 Water information system for Serbia
IT and water planning expert
Development of GIS-based water information system to the Serbian water authorities.

2006 Development of DSS IT framework
DSS co-ordinator, project leader, software architect
Development of an IT architecture that facilitates the cost-effective development of tailor-made decision support systems (DSS) based on existing in-house building blocks.

2002 – 2004 HarmonIT
Project leader, software architect, hydrologist
Development of software architecture for a component-based European standard for hydrological models – the OpenMI Standard.

2002 Mike Objects
Project leader, software architect
Development of software architecture and generic software components.

2002 Training of Water Resources Institutes, Vietnam
Hydrologist and modelling expert
Capacity building and consultancy work. Teaching modelling techniques for integrated water resources management and coaching ongoing projects.

2001 – 2002 DHI software architecture project
Project leader, software architect
Development of new overall software architecture for the DHI Mike models.

2001 Teaching at DTU
Hydrologist, modelling expert
Integrated Water Resources Management Course at the Technical University of Denmark.

2001 MikeBasin development
Project leader, responsible for development, training, sales, marketing
Development of an integrated water management application.

2001 Integrated Water Quality / Limnology Study for Lake Victoria
Hydrologist
Surface water modelling.

2000 Model development and training, Western Australia Water and Rivers Commission
Hydrologist
Development of dedicated reservoir operation model and on-site training of WRC staff.

1999 Training of Sri Lanka Western Rivers Authority staff
Hydrologist
Training of staff in water resources management modelling.

1999 Cape Fear water resource plan, USA
Hydrologist, responsible for code developments, tailoring the MIKE BASIN to client's needs
Development of  integrated water management application, MIKE BASIN 2000.

1999 Hydrological and technical support to HydroData, Torin, Italy
Hydrologist
Hydrological and technical advice for the modelling of Alpine catchments with special emphasis on utilisation of hydropower.

1998 Zambezi Action Plan, Zambia
Hydrologist
Training of staff from Zambezi River Authority in river basin management.

1998 Water quality modelling, Czech Republic
Hydrologist
Leading the model design and model development.

1998 DHI commercial software product development, Denmark
Software designer
Development of C++ class library for time series analysis.

1997 Reservoir modelling, Wielowies Klasztorna, Poland
Hydrologist
Model development, training of client’s staff.

1997 Teaching hydrological modelling, Asian Institute of Technology (AIT), Thailand
Faculty member, associated professor
Teaching course in hydrological modelling and instructing Master and PhD students.

1996 National Water Master Plan, Algeria
Hydrologist and software developer
Upgrading of the Water Use Simulation (WUS) model applied for basin-wide analysis of alternative development scenarios for water supply, irrigation, hydropower generation, inter-basin transfers etc.

1995 Training in Surface and Groundwater Hydrology, AIT, Thailand
Lecturer and instructor in hydrological data analysis and hydrological modelling 
A joint AIT/DHI training programme for staff from the Bangladesh Water Development Board.

1994 Groundwater contamination, Lillerød waterworks, Denmark
Groundwater modeller
Design of remedial actions for groundwater.

1994  Groundwater modelling research
Research assistant 
The Danish Environmental Research Programme. Project 2.1: Groundwater recharge under heterogenous conditions with multi-aquifer systems.
Application and development of the MIKE SHE modelling system for flow and solute transport predictions in complex three-dimensional aquifer systems.

1994 Groundwater modelling research
Research assistant
The Danish Environmental Research Programme. Project 2.2: Transport and reduction of nitrate in macrospores in the temporally saturated zone and in the groundwater zone. Application and development of the MIKE SHE modelling system.

1994 Particle tracking model development
Software developer
Development of particle tracking module in the MIKE SHE groundwater modelling system.

Publications

OpenMI design patterns for river-groundwater interaction

P.J.A Gijsbers, Deltares-Delft Hydraulics, The Netherlands, J.B. Gregersen , DHI Water, Environment and Health, Denmark

P.Sinding, DHI Water, Environment and Health, Denmark

S.Hummel, Deltares-Delft Hydraulics, The Netherlands

MODFLOW and More Conference, International Ground Water Modeling Center, Colorado, USA. 2008
 

OpenMI: OpenMI – Open Modelling Interface

J. B. Gregersen DHI – Water & Environment Denmark, P. J. A. Gijsbers WL/Delft Hydraulics The Nederlands, S. J. P. Westen WSL – Wallingford Software Ltd U.K.
Journal of Hydroinformatics, 09.3 2007.

OpenMI: The essential concepts and their implications for legacy software

J. B. Gregersen DHI – Water & Environment Denmark, P. J. A. Gijsbers WL/Delft Hydraulics The Nederlands, S. J. P. Westen WSL – Wallingford Software Ltd U.K. , and M. Blind RIZA Institute for Inland Water Management and Waste Water Treatment The Nederlands. Advances in Geosciences, 4, 37–44, 2005 SRef-ID: 1680-7359/adgeo/2005-4-37, European Geosciences Union © 2005

Towards an Open Modelling Interface (OpenMI) the HarmonIT project

M. Blind, Directorate-General of Public Works and Water Management, Institute of Inland Water Management and Waste Water Treatment (RWS-RIZA), PO Box 17, 8200AA Lelystad, The Netherlands, J. B. Gregersen, DHI – Water & Environment, Agern All´e 5, 2970 Hørsholm, Denmark. Advances in Geosciences, 4, 69–74, 2005, SRef-ID: 1680-7359/adgeo/2005-4-69, European Geosciences Union, © 2005.

OpenMI: A glue for model integration
Gijsbers,  PJA WL/Delft Hydraulics, The Netherlands, and J B Gregersen DHI Water and Environment, Denmark. MODSIM05, International Congress on: Modelling and simulation, Melbourne, Australia, December 2005.

Applying the Open Modelling Interface (OpenMI).
Dudley, J WRc plc, UK, W Daniels Wallingford Software Ltd, UK, PJA Gijsbers WL/Delft Hydraulics, The Netherlands, D Fortune Wallingford Software Ltd, UK , S Westen Wallingford Software Ltd, UK, and JB Gregersen DHI Water and Environment, Denmark. MODSIM05, International Congress on: Modelling and simulation, Melbourne, Australia, December 2005.

OpenMI: The essential concepts and their implications for legacy software
The International Environmental Modelling and Software Society Conference
University of Osnabrück, Germany , 14-17 June 2004 
J. Gregersen, DHI Water & Environment, Denmark, M. Blind, RIZA, The Nederlands
 

Towards an Open Modelling Interface (OpenMI) – The HarmonIT project
The International Environmental Modelling and Software Society Conference
University of Osnabrück, Germany , 14-17 June 2004
M. Blind, RIZA, The Nederlands J. Gregersen, DHI Water & Environment, Denmark

OpenMI - New Opportunities for Model Developers.
6th International Conference on Hydroinformatics - Liong, Phoon & Babovic (eds)
© 2004 World Scientific Publishing Company, ISBN 981-238-787-0
STEFAN WESTEN Wallingford Software Ltd., HR Wallingford Group, Howbery Park Wallingford, Oxfordshire, OX10 8BA, UK, DAVID FORTUNE, Wallingford Software Ltd., HR Wallingford Group, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, UK, JAN GREGERSEN,DHI Water & Environment, Agern Alle 11,DK-2970, Horsholm, Denmark
 

OpenMI: Harmonizing water management through an open modelling interface
Douglas N. Graham1, P.J.A. Gijsbers2, Jan Børge Gregersen1
MODFLOW and More 2003: Understanding through Modeling, Sept 16-19, 2003, Golden, CO. Editors: E.Poeter, C.Zheng, M.Hill, J.Doherty
 

MikeObjects – The Open-Ended Architecture of DHI Software
Sales, M., T., T. Bech, J. B. Gregersen. Proceedings 1st North American DHI Software Conference, June 2002, Florida, USA.

Integrated Water Resources Modelling And Object Oriented Code Architecture
Havnø, J., H. R. Sørensen, J. B. Gregersen. Conference on Water Resources Modeling and Management, Japan academic society of hydraulics. November 2001.